Machine for making electrical coils



"June 29 ,1926. 1,590,589

w MILLER MACHINE FQR MAKING ELECTRICAL COILS Filed Nov. 7, 1923 2Sheets-Sheet 1 Byf 4 7/119 .Fffarncys.

June 29 1926. 1,590,589

- w. I... MILLER MACHINE FOR MAKING ELECTRICAL COILS v Filed Nov. '7.1923 2 Sheets-Sheet 2 fi W- Z13 Ff arrreys.

Patented June 29, 1926.

UNITED STATES 'iVII LIAIhI L. MZLLE E, OF ST. PAUL, MINNESOTA.

MAQHINE non MAKING ELECTRICAL ooILs,

Ap ca o file N v mb lily injvcntion regates to electrical coils andmachine tor making the ame and has tor its ObjQCt to provide a coiladapted to be ied upon the 1te rior of a tube or Sll11l.

l'ir structure.

Another object of the invention resides in torn'iing a coil havingalternate layers of Wire and tubing. the innenrnost layer hetornied onthe interior of the tube.

'rlnother object of the invention resides in provic 'ng tubes forelectrical coils of laminated.ior nation u" j Y may be built up to anydesired thicln iess and may be construct ed ofz W cliaineterot lenq-threquired.

A. still further object of t s invention resides in the process offorming said ,coil and in providing a machine for constructing the same.

Other objects of the invention reside in t e detailed construction ofthe machine for nine thecoils.

Another object of the invention resides pro W It means tor forming upona s1n gggle n ac- 11 coils Oil any d ameter or length or of thickness oftube or .core and of forming layers of ire upon the interior or exteriorof said tube or of inibedding said of wire Within the tube.

iull objects aud advantages of my ion will be oi-ind in the detaileddcparticularly pointln the drawings forming part of this iication: 'ure1 is a plan View of the inve .tion. re is a side QlGxfiiTiOllll VlGW ofthe he shown in Fig; e l. 'i'l'lustratng a pore same in section. Figure3 a se tional view of the fornidrum of the invention. i use at is alongitudinal sectional yiew ot' portion cl one of the coils.

Figure is a transverse sectional View of a portion of one of the coils.

lily invention consists primarily in the VI' of coils for electricalpurposes espeted to ,use with radio apparatus. One of the primarfeatures of the invention resides" in pro iding a coil upon the rior ofa tube as Well another coil ,z-rterior of the said tube thereby reducingthe expense .of constructing the coils and simplifying the formation ofthe 7, 1923. Serial No. 673,273.

the required number of turns. A continuous strip of guinnied paper orother suitable material having an adhesive applied to the same is thensuccessively Wrapped about the coil with the adhesive side adjacent tothe coil so that the same adheres thereto. "When suitlicientconvolutions of paper l'iave been Wrapped about the Winding to form atube of the required thiclrnesspthe second winding is placed upon thetube completing the coil. Upon collapsing the drum. on which the coil isconstructed, the entire coil may be completely removed therefrom withboth the inner and outer coils securely attached to the tube proper. Byemploying this principle of forming coils upon either the inner or outersurface of a tubular core .or ot'imbedding the layers of vi-re withinthe tubes coils may be made which can the used for varionieters,i'z'iriocouple-rs audio or radio frequency traustorniers or in fact anytype ot'imlu'ctauce used in radio construction.

In the construction of electrical coils in accordance with my invention.the same arc )referably constructed as follow; A layer ot Wire 'is firstWound upon a collapsible drum and the ends oi the same properly secured.A tube is t ien bu upon the drum by a-p 'rlying to the top 01: the layera band of tube stock which has bee-n coated with ,sui' blc adhesive.This tube stool: is then l in Fl "l1[-i a and a in use of the coil; isiudicattul at ill. the tube at ($8 and the second layer of Wire at 69.It desired; a layer oi tuhc material car. first be Wound upon the drumand the alts ativc layers of Wll'G and tube stoclrplaced upon the sameso that-any num- ;ber of coils may he formed in alternate re lation andinihcdded Within the coil. The number of difi rent ty es of coils whichcan be made with my invention are innumerable. Qt the said coils, coilsWith an air core between the windings may be mentioneejl. For use as avariccoupler such a coil would be constructed with the main coil orstationary coil Wound upon the interior of the tube and with the rotarycoil Wound upon the exterior of its tube. In

' tioned a shaft 22.

multiple winding, coils of similar nature where the coupling is fixed,the coils may be constructed with the wire wound upon the interior ofthe larger core, and upon the exterior of the smaller core. T hemarginal portion of the smaller core could then be built up to the samediameter as the internal diameter of the larger core with narrow tubestool; and the larger core slipped over the same. Such a coil heated todrive out the moisture could be hermetically sealed, if desired, toprovide a moisture proof coil.

The machine for forming the coils is best illustrated in Figures 1 and2. This machine comprises a base 10 upon which are mounted fourstandards 11, 12, 13 and 14 supporting the structure of the same. Thesestandards are provided with uprights 15, 16, 17 and 18 and with feet 19connected therewith by means of which said uprights may be attached tothe base through screws 20. The upper ends of the uprights 16 are formedwith grooves 21 extending longitudinally along the same in which isposi- The shaft 22 is threaded at its circular portion at 23 and hasscrewed upon it two nuts 24 and 25. Upon the said shaft adjacent thenuts are placed two vertically positioned plates 26 and 27 which areformed with a portion of the same struck out from the metal thereof asindicated at 28 whereby the same are arranged in yieldable relationthereto. Between the plates 26 and 27 is positioned a roll of material31 from which the tubes of my improved coils are constructed, which rollis held in frictional engagement with the said plates by means of thenuts 24 and which engage the spring portions 28 of the same; For holdingthe plates 26 and 27 from rotation, a bar shown in dotted lines at 29 isemployed which extends across the upright 16 of standards 12 and 14. Theplates 26 and 27 are formed with notches 30 engaging this bar wherebythe same may be positioned in any relation upon the same.

By this arrangement, the roll of tube material 31 may be placed in anyposition along the shaft or spindle 22 and any tension may be securedupon the same.

For guiding the tube material as the same leaves the roll 31, I employtwo rollers 32 and 133 which are provided with trunnions 33 journalledin the upright 15 of standards 11 and 14. These rollers are positionedone above the other as shown and the stock passes as indicated at 34over the roller 32 and beneath the roller 133. For guiding the stockover said rollers, I employ a number of adjustable flanges 35 which maybe secured in place upon the said roller at any locality thereon bymeans of set screws 36.

Between the two standards 11 and 12 are positioned two troughs 37 and 38in which are rotatably mounted two moistening or adhesive applyingrollers 39 and 40. When a gummcd tape is used for iorining the tubes,water is placed in the troughs 37 and 38 as indicated at 14 to a heightsufficient to come in contact with the lower surface of the saidrollers. If a blank stock is used. a liquid adhesive is placed in saidtroughs. It will be noted that the lower portion of the rollers and 133is below the upper portions of the rollers 39 and 40 so that the stock,upon leaving the roller 133, comes in contact with the upper portions ofthe rollers 39 and 40. At the same elevation as the roller 133 ispositioned a similar roller which is journalled to the upright ofstandard 12 and below which the stock 34 passes previous to being formedinto tubes. at the upper end of the uprights 17 of standards 12 and 13is journalled a drum A in a manner to be presently described, on whichis formed the coils previously referrer to, which will be more fullyexplained in detail. The stock of the tube forming material 34 as beforestated, passes over the roller 33 successively over both of the rollers40 and 39 and then beneath the roller 42 and up to the drum A where thetubes are formed by rotating the said drum as will be presentlyexplain-ed. For increasing the surface of contact of the stock as itpasses over the rollers 39 and 40, a roller is employed which is similarin construction to the rollers 32 and 133 and which is formed withtrunnions 33 similar to those of the rollers 32 and 133. By means ofthese trunnions, the roller 43 is journalled in two arms 44 which are inturn pivoted at 45 to the up rights 15 of standards 11 and 14. lVhen thesaid arms are swung downwardly, as shown in full lines in Figure 2, theroller 43 will hold the stock of material. in contact with themoistening of adhesive applying rollers 39 and 40 which causes thestool: to become moistened or coated with adhesive as the same passesthrough the device.

F or supporting the roller in its operative position, I provide twostops 46 which are formed integral with the upright 15 and which areadapted to engage below the arms 44 to prevent the roller 43 fromdropping downwardly below the desired point. For preventing the roller43 from being raised when tension is placed upon the stocl; of material34, a coil spring 47 is usedwhich is seated against a bar 48 extendingacross the two uprights 15 of standards 11 and 14 at one end and at itsother end in a socket 49 attached to the end of a screw 50 mounted in anupright 51 which is attachel to a similar bar shown in dotted lines inFigure 2 at 52 secured to the arms 44. By this means, the roller 43 isnormally held to cause the stock of material, as it passes over therollers 39 and 40, to become properly moistened or coated with adhesiveas 'required.

The cons ruction of the tube forming deviceA' is best illustratedFigures Qand 3.

tached semi-circular blocks when the drum 52 is in itsnorinal'p'osition, remain sp oed from" one another. By-bring- 'ing'these blocks together,- thednunmay be collapsed suiiieiei'itlyJCOIEHIOVS the-tube and coil constructedthereontherefrom, as Willpresently'be described. Alon the axis of the-'d-rurn52; I position a'squa're shalt 56 which fits into notches 57' and- 58 formed in theblocks 54 and 55. When the said blocks are held together, the same-arecaused to' clamp upon" the shaft 56 to cententhe said drunru pon thesaid shaft and l1o1d-thesa1ne 't'roin movement thereon.

For latching the blocks 54 and 55togethe13I employ a hook 64 which ispivoted at 65 to the block and Which engagesat its ho'oked end a pin 59formed on theend of the 'bloclrbe. By "this means the block and drum maybe securely attached to theshaft 56' as before specified.

The shaftbti, asbefore stated,- is square throughout its lengthexcepting at two portions thereof indicated at 60 and 61 Where the sameis formed of cylindrical construction' to Provideportions whereby thesaid shaft may be journalled. Thisshaft is' journalled' in the uprights170t' standards 12and 13 as best shown in Figure' Thebea'ri ngs for thisshaft art partlyformed in the said upright 17 and are furtherfori'ne'd'by'ineans of caps 61 which are hingedly connected at 62 to said upright17. These capsniay'be closecl dor-m upon'the shaft 56 to=properlyjournal the same or the sa 'd' caps'inay be 'ang out of theway to pevice when the occasion arises. 'For holding the said caps in place,-'Ieinploy hooks 63 pivoted to said caps vhieh are adapted to one pins (56in the said --uprights.

In forming the tubes of the in-Ventioin'the tube stoclgindicated at St,is attached'to the periphery of "the drain 52 and the same wound uponthe tube by tur-ning'theshatt 56 by means of a handle 6'? secured to'theeX- terior thereof. lihen-sutiicient amount of tube stock has been Woundupon the drum, the same is cut 05 and the encl-'-sealecl'u'pon the tu e.After removing shaft frein the machine by-raising the caps 3L the latch6i may be disengaged; p'e ting the entire drum to be"re1noved from themachine after Whi' h *WlliC'l'l are attached to bosses 71* harin Thisdevice consists or a tube or drunvportion 52 which is slit-ate?) along;an elenrent thereof. At the ends of the'druin 52 areatt initthe completeremoval of the drunrand' shat from the "dethe drum and i i the same:niaybecollapsed to remove the tubeiornied thereon the 1 upper ends ofthe upright 18 0t stench 'ards l2 a'nd13. -=Upon tlnsbr-u: resli'chiblyenounted twoWingshaped guides wand .vcrews 72 therein by -1neans ofWhichguides may be adjustably positionedwhereever required upon'saidbaror rod In this manner,- the stock upon leavingthe drum A-Inay be''guided so that a tube having *slnoothends may be providedtherebyrewhich ispositioned Within the interior of the drum 52. This member istorinethwith a head portion 73 lyin'ghdjacent the underedge of the'drum-at the opening therein and WIltlYR'IlOthGl head 'portion 7-11;adapted to rest against tlleShZlittfiG. Thesaid memher is provided witha stemportion 76' by Ineans of'which the S'zlDGlSPlYOEECl to "the endblocks 55. At thBQliliOlllE end or the head portion 73"a're provided ainnnberot sharp points '77 'which project illiO'tlgll the opening where"the seine are adapted to engage the tube stock and holdthe place as thedrum is' rotated. llhen it is dcsired, tohold' the device fronrnse, thesame is swun'g on the pivot-'76 until it takes the position shown-indotted lines at '78 where a corner of theshait SU-engages'anotch 79torinedin HIQHlhQI 72 'l'rolding it as required After the tube 'st-ockhas' been severed'upen theeornpletion of a tube, the end of the stock'rema'ining'attached to the tubeis Wound up and attached totliietube'proper. The stock remainingattached tothe roll (El-is thendrawn back over the"rollerl=l3 and-attached to a number ofEDOlHtS'SOTOllllQCl upon. a bar they reach the b'osit'i'on shown "indotted linethen in Figure This structure may held in this position bymeans pivoted to thestop' e16, which tinge i" ed toe Q e against a'lugSQ't'oi arni 4st. \Vhen 'so 'positi'one'd L Wiil noted that the st ock3a held upwardly and away from both of the relic-r339 and'fl. The reasonforthis is obvious. I the stock Were allowed-to i-est-upon the .idrollers, the same would soon adhere t e eto causing]: the machine tobecome "gi'uni-ned up and rendered"inoperable.

For Winding the Wire upon the drum A, the follow'v'ing structure isen-xpl" 'ed: .4 ing; outwardlyirointhe uprights 17 a VlClQCltwobra'ekets 83 which hai'e -rie itil y secured to the same at thee:treine end thereof. a transversely positioned rod 8 l. Upon this "rod.is slidably and' rotatably mounted.- a pal ti L- ley 85 Whichserves tofeed the wire upon the drum as the drum is rotated. In addition to thepulley 85, a yolred member 86 is also employed which is slidably mountedupon the said rod S t and which is adapted to slide the pulley 85 badand forth as the said inen'iber is reciprocated. This member has alinger 87 attached to the same, which finger is shown in dotted lines inFigure 2 and is formed with a single thread 88 adapted to engage athreaded spindle 89 rotatably mounted in the arms 83. [is this saindleis turned, finger 87 is caused to advance along the same and the pulleyS5 moved therewii'jh.

For driving the spindle 8, a gear 90 is employed which is directlyattached to the shaft 56. This gear mesh 2 with another gear 91 having atrunnion termed thereon by means of which said 'ear directly journalledin the arm 83. The spindle 89 as will be noted in Figure 2, has a squaed end 93 which is adapted to tit into a. corresponding socket formed inthe trunnion 92 of gear 91. This spindle is further pro videdwitliabearing portion eta diai'neter larger than the diameter of thesaid spindle so that the same can be withdrawn through the arm 96 fromthe device without disturbing the gear 91. A keeper 9" pivetally securedto the arm 96 serves to hold the spindle 89 in place during theoperation of the device. By swinging this reeper away from the end 95 ofpivot 89, the said shaft may be removed, as before stated.

In using the device, the member 86 is swung outwardly as shown in dottedlines in Figure 2 and the said member slid along until the pulley 85occupies the position to which it is desired to commence the coil. Thesame is then swung upwardly until the single thread 88 engages thethreads on the spindle 89. A keeper 9S pivoted to the underside of thefinger 87 is then swung; beneath the spindle 89 so that the. thread 88is held in engagement with the threads of the said spindle. By rotatingthe crank 67, the drum 52 is caused to rotate, which, in turn, rotatesthe spindle 89 and causes the wire to be fed along the drum the same iswound thereon. It can readily be understood that different pitches ofthread can be formed upon the spindle 89 so that the different sizes ofwire may be equally as well. wound upon the drum. It is therefore merelynecessary to have one spindle, such as shown at 89, for each size ofwire and to interchange the same when it is desired to wind thedifferent sizes of wire upon the machine.

For holding the wire spool, the structure. shown in Figure 2 isemployed. A spool 99 containing the wire to be wound upon the drum 52 ispositioned upon a spindle 100 of the same construction as the spindle 22on which the roll 31 is mounted. This spindle is adapted to be slid intotwo slots 101 where the same becomes firmly lodged. Upon the saidspindle are screwed two thumb screws 102 similar to the thumb screwswhich engage two plates 103 bearing against the flanges oi the spool 99and trictionally engaging the same to provide the required tension.These plates are held from movement by a bar 10% extending across theuprights 17 in the same manner as the bar Vith this construction, thespool 99 may be positioned in any place upon the spool 1G0 and thetension of the wire leaving the same may be regulated as required.

In using the device, the following procedure is adopted: li'leniber 86is first swung downwardly to occupy the. position shown in dotted linesin Figure 2. If it is desired to provide a coil which is wholly imbeddedwithin the tube, the stock 3% is run beneath the drum and secured to thepoint 7? previously referred to. By turning the handle 67 clockwise, thesame is wound upon the drum 52 with the gummed side on the e2;- terior.This process is continued until a tube of the required thicknessprovided. The stock is then cut, the free end oi the same attached tothe prongs 80 and the arms resting as shown in dotted lines in FigureThe pulley S5 is then slid along to the required position upon the tubethus formed and the Wire from the spool 99 drawn up and passed over thesaid pulley and secured to the tube thus formed in any suitable manneras by piercing a hole through the said tube at the slot in drum 52 andextending the free end of the wire into the said drum. The handle 67 isthen rotated until the required number 01" turns of wire have been woundupon the tube. The wire is then cut and the free end secured to the tubein the same manner. By now releasing the stock from the points 80 andcutting; off the dried portions of it, the same may be attached to thecoil or reel of wire. thus wound upon the tube and the re mainder of thetube finished. the stock being positioned between the guides 69 and andattached to the rearward side of the drum where the same may be woundupon the drum by turning the handle 67 in a counter clockwise directionuntil the tube assumes the required thickness. After the stock has beensevered, another layer of wire may be wound upon the coil and, ifdesired, a third tube placed over the. same. If desired, the layer ofwire may be wound directly upon the drum and the tube stock directlywound upon the said layer of wire. lVhen a coil has been completed, thecaps 61 are released and thrown back which permits the shaft 56 and drum52 attached thereto to be removed :trom the machine. Then the said drummay be collapsed by releasing the hooks 64 and withdrawing the shaft 56.to-

gether with:- the gear; '90 and icrank; handle 67. attached l3ll81.6f0.from-said .idrumi This permits the sectionsofthecdrum to be forcedtowardone; another releasing. the coil which: may be easily slid off fromthe-same: It'rcan readilybe seen that many different types ofelectricalcoilsimay. be formed on: the mar.

chineemploying one or more layers ofjwire supported upon. or within. atube. one tube with .a coil within thesameand another tube with acoiluponthe exterior of the same, variable inductances can beconstructedhaving a very closecoupling;

The advantages of my invention are mani-.. fest. A DHLChLDUlS provlded-by means of.

which all varieties of coils, such as used in radio work, may bereadilyconstructed without the expense of carrying a large stock of tubes uponwhich to build the same. Atthe same time, primary and secondary coilsmay be wound one within another employing but a single tube therebygreatly reducing the cost of the same. If desired the. coils may bewholly imbedded within the tube material so that tile same are notexposed to view and are protected from injury or breakage. The machinefor constructing the coils is of such a nature that the coils may beaccurately and quickly made. Tubes of any desired thickness can bereadily made and by interchanging of drums, the. diameter of the tubecan be adjusted at will. If desired, uncoated or gumined paper or othersuitable tube stock may be employed with the machine to construct thetubes of any material desired. The tube stock is fed along throughoutthe machine and is guided by the guides and adjustable flanges on therollers so that the same becomes evenly wound upon the drum, therebyforming a smooth i'iniform tube. The wire is automatically fed along thetube so that a smooth, uniform coil is produced and by interchanging thesaid spindles any size of wire may be equally as well wound upon thetube, which may be tight wound or spaced. The machine is so constructedthat alternate layers of wire and tube stock may be wound upon the drum,thereby permitting coils of any design to be constructed.

In accordance with the patent statutes, I have described the principlesof operation of my invention, together with the apparatus which I nowconsider to represent the best embodiment thereof, but I desire to haveit understood that the construction shown is only illustrative and thatthe invention can be carried out by other means and applied to usesother than those above set forth within the scope of the followingclaims I claim:

1. A process of constructing electrical coils consisting of winding acoil upon a collapsible drum, of applying adhesive to By using,

a ,,continuousi strip; of :tube stock; of. wrapl gcs id tllbestockgwithathe adhesive side in contact with said coil about said coiland drum untilthedesired thickness of; tube stock is secured and )of.collapsing-said drum and removing thesamefrom said coil.

Ii process of constructing electrical coils consisting. of windingawinding; upon a collagpsilgileidrum, of applyingadhesive to arontinuous. strip of tube stocln; of. wrapping said .tubestock; the.adhesive sidei'in; contact with said coil about said coil :and drumuntil .the desired thickness oftubestoclris secured, of winding a second..windingupon. theeXter-ior.of'said tubeand of. collapsing saidedrum.and removing the same. from the said coil.

3. A machine for forming electrical coils comprising a winding drum, apair of ad hesive applying devices, means for feeding tube stock acrosssaid adhesive devices. means for depressin said tube stock between saiddevices 101' increasing the surfaces of contact therefor and means forapplying tension to said tube stock.

l. A machine for forming electrical coils comprising a winding drum, :1pair of ad hesive applying devices, means for feeding tube stock acrosssaid adhesive applying devices, means for depressing said tube stockbetween said devices for increasing the surface of contact thereof,means for securing the free end of said tube stock to said depressingmeans and means for supporting said depressing means in elevatedrelation relative to said adhesive applying means to bring said tubestock away from said adhesive applying means.

5'. A device for forming electrical coils comprising a support, a pairof adhesive applying devices, means for feeding tube stock across saidadhesive applying devices. a pair of arms hingedly connected to saidsupport, a roller pivoted to said arms and adapted to depress said tubestock between said adhesive applying devices to increase the surface ofcontact therewith, means formed on said arms for holding the extreme endof said tube stock when the same has been severed, resilient means forholding said roller in engaging position and means for holding said armsin elevated position to bring said tube stock away from said adhesiveapplying devices after the end of the tube stock has been secured tosaid holding means.

6. A. machine for forming electrical coils comprising a collapsibledrum, means for supporting said drum whereby said drum be removed in itsentirety, means for feeding wire upon said drum, means for feeding tubestock upon said drum and means for causing said drum to rotate.

7. A machine for forming electrical coils comprising a pair of reelstandards, a

pair of forward standards positioned in spaced relation to said reelstandards, a shaft for supporting a roll of tube stock, mounted on saidreel standards, means for applying tension to said tube stock, a pair ofadhesive. applying devices positioned between said pairs of sandards, aplurality of rollers secured to said standards for guiding the tubestool; over said adhesive applying devices, means for holding said tubestock in engagement therewith, a drum rotatably mounted in said forwardstandards and guides for guiding said tube stock from said rollers tosaid drum.

8. A process of constructing coils consist ing of winding a coil upon acollapsible drum, of supplying adhesive tube stock, of

wrapping said tube stock in contact with said coil about said coil anddrum until the desired thickness of tube stock is obtained, and ofcollapsing said drum and removing the same from said coil.

9. A process of constructing electrical coils consisting oi Winding acoil upon a collapsible drum, of wrapping adhesive tube stock with theadhesive side in contact with said coil about the same and wrapping thetube stock there about until the desired thickness of tube stock issecured, of winding a second coil upon the exterior of said tube and ofcollapsing said drum and removing the same from said coil.

WVILLIAM L. MILLER,

